1) Use Language Bar to switch between English and Urdu input
To add language bar, right click on Task bar -> Toolbars -> Language Bar
Now you can just click on EN (or UR) icons to switch language

2) Use shortcut keys to switch between English and Urdu input
To add shortcut keys:
2a) Open Control Panel
2b) Open “Regional and Languages Options”
2c) Click on “Languages” tab
2d) Click on “Details”
2e) Click on “Key Settings”
2f) Use “Change key sequence” button to select the key sequence you want to use to switch between available languages (I am using Alt+Shift)